n. a crash. Synonym: wipeout. v. "I biffed and then wiped away the blood."

From the Dictionary of Mountain Bike Slang

BI = B = Big Gray Wall

biff /bif/ vt.

To notify someone of incoming mail. From the BSD utility biff(1), which was in turn named after a friendly dog who used to chase frisbees in the halls at UCB while 4.2BSD was in development. There was a legend that it had a habit of barking whenever the mailman came, but the author of biff says this is not true. No relation to B1FF.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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